<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>逆转世界</title>
</head>

<body>
    <div id="app">
        <div>{{msg}}</div>
        <button @click="btn">点击逆转</button>
    </div>
</body>

</html>
<script src="vue.js"></script>
<script>
    new Vue({
        el: "#app",
        data: {
            msg: "Hello，World",
        },
        methods: {
            btn() {
                this.msg = this.msg.split("").reverse().join("");
            },
        },
    });
</script>